Fungus is a type of organism that belongs to its own kingdom, separate from plants and animals. It includes a wide variety of species, such as mushrooms, yeasts, and molds. Fungi play essential roles in ecosystems, breaking down organic matter and recycling nutrients. Fungi reproduce through spores, which can be spread by wind, water, or animals. They can be found in many environments, from soil to decaying wood. Some fungi are beneficial, like those used in bread and beer production, while others can cause diseases in plants, animals, and humans.